The exam simulator for CCNA ICND2 by CertExams.com contains 300 questions with testlets, simlets, and router simulations. Checkout http://www.certexams.com/cisco/ccna-icnd2/exam-details.htm for more information.
ICND2 along with CCENT (ICND1) needs to be passed for obtaining CCNA certification. CertExams offers practice tests for several vendor certifications including CCNA, CCENT, ICND, CCNP, A+, N+, Sec+, and others.